mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 01:52:46 +00:00
fd8a724e77
* bump go swagger version * bump swagger version
223 lines
5.3 KiB
Go
223 lines
5.3 KiB
Go
// Copyright 2015 go-swagger maintainers
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package runtime
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import (
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"bytes"
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"encoding"
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"errors"
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"fmt"
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"io"
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"reflect"
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"github.com/go-openapi/swag"
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)
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func defaultCloser() error { return nil }
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type byteStreamOpt func(opts *byteStreamOpts)
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// ClosesStream when the bytestream consumer or producer is finished
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func ClosesStream(opts *byteStreamOpts) {
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opts.Close = true
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}
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type byteStreamOpts struct {
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Close bool
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}
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// ByteStreamConsumer creates a consumer for byte streams.
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//
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// The consumer consumes from a provided reader into the data passed by reference.
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//
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// Supported output underlying types and interfaces, prioritized in this order:
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// - io.ReaderFrom (for maximum control)
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// - io.Writer (performs io.Copy)
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// - encoding.BinaryUnmarshaler
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// - *string
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// - *[]byte
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func ByteStreamConsumer(opts ...byteStreamOpt) Consumer {
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var vals byteStreamOpts
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for _, opt := range opts {
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opt(&vals)
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}
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return ConsumerFunc(func(reader io.Reader, data interface{}) error {
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if reader == nil {
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return errors.New("ByteStreamConsumer requires a reader") // early exit
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}
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if data == nil {
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return errors.New("nil destination for ByteStreamConsumer")
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}
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closer := defaultCloser
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if vals.Close {
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if cl, isReaderCloser := reader.(io.Closer); isReaderCloser {
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closer = cl.Close
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}
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}
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defer func() {
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_ = closer()
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}()
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if readerFrom, isReaderFrom := data.(io.ReaderFrom); isReaderFrom {
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_, err := readerFrom.ReadFrom(reader)
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return err
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}
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if writer, isDataWriter := data.(io.Writer); isDataWriter {
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_, err := io.Copy(writer, reader)
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return err
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}
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// buffers input before writing to data
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var buf bytes.Buffer
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_, err := buf.ReadFrom(reader)
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if err != nil {
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return err
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}
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b := buf.Bytes()
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switch destinationPointer := data.(type) {
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case encoding.BinaryUnmarshaler:
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return destinationPointer.UnmarshalBinary(b)
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case *any:
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switch (*destinationPointer).(type) {
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case string:
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*destinationPointer = string(b)
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return nil
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case []byte:
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*destinationPointer = b
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return nil
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}
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default:
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// check for the underlying type to be pointer to []byte or string,
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if ptr := reflect.TypeOf(data); ptr.Kind() != reflect.Ptr {
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return errors.New("destination must be a pointer")
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}
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v := reflect.Indirect(reflect.ValueOf(data))
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t := v.Type()
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switch {
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case t.Kind() == reflect.Slice && t.Elem().Kind() == reflect.Uint8:
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v.SetBytes(b)
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return nil
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case t.Kind() == reflect.String:
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v.SetString(string(b))
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return nil
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}
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}
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return fmt.Errorf("%v (%T) is not supported by the ByteStreamConsumer, %s",
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data, data, "can be resolved by supporting Writer/BinaryUnmarshaler interface")
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})
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}
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// ByteStreamProducer creates a producer for byte streams.
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//
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// The producer takes input data then writes to an output writer (essentially as a pipe).
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//
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// Supported input underlying types and interfaces, prioritized in this order:
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// - io.WriterTo (for maximum control)
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// - io.Reader (performs io.Copy). A ReadCloser is closed before exiting.
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// - encoding.BinaryMarshaler
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// - error (writes as a string)
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// - []byte
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// - string
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// - struct, other slices: writes as JSON
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func ByteStreamProducer(opts ...byteStreamOpt) Producer {
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var vals byteStreamOpts
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for _, opt := range opts {
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opt(&vals)
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}
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return ProducerFunc(func(writer io.Writer, data interface{}) error {
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if writer == nil {
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return errors.New("ByteStreamProducer requires a writer") // early exit
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}
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if data == nil {
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return errors.New("nil data for ByteStreamProducer")
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}
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closer := defaultCloser
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if vals.Close {
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if cl, isWriterCloser := writer.(io.Closer); isWriterCloser {
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closer = cl.Close
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}
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}
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defer func() {
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_ = closer()
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}()
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if rc, isDataCloser := data.(io.ReadCloser); isDataCloser {
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defer rc.Close()
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}
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switch origin := data.(type) {
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case io.WriterTo:
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_, err := origin.WriteTo(writer)
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return err
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case io.Reader:
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_, err := io.Copy(writer, origin)
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return err
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case encoding.BinaryMarshaler:
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bytes, err := origin.MarshalBinary()
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if err != nil {
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return err
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}
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_, err = writer.Write(bytes)
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return err
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case error:
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_, err := writer.Write([]byte(origin.Error()))
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return err
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default:
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v := reflect.Indirect(reflect.ValueOf(data))
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t := v.Type()
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switch {
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case t.Kind() == reflect.Slice && t.Elem().Kind() == reflect.Uint8:
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_, err := writer.Write(v.Bytes())
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return err
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case t.Kind() == reflect.String:
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_, err := writer.Write([]byte(v.String()))
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return err
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case t.Kind() == reflect.Struct || t.Kind() == reflect.Slice:
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b, err := swag.WriteJSON(data)
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if err != nil {
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return err
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}
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_, err = writer.Write(b)
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return err
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}
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}
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return fmt.Errorf("%v (%T) is not supported by the ByteStreamProducer, %s",
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data, data, "can be resolved by supporting Reader/BinaryMarshaler interface")
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})
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}
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